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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '14b77efe1f31df5b4b8d69d9e49b556e7f116db783ed4477c463b3ae474c7e1d' 
  AND token = 'Z59aqvvdcq4HkN/oH9svayXfZz/VbHC7wG4b7cnBTRE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}