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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'eb3338a6b235f565ae2a594db6c7f30f2c8551d5c4c136b5529b973077549c5f' 
  AND token = 'PbNmLzr3N+hgNxDkaRk1DGKLZ111YnyHg6nU2Y5qJCA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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