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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'df874572ef64e9e574dbd0e25375d5a33997f27a64b470ddc807fa34314dabb3' 
  AND token = '7kSGRa5lyK+X48cHSvUIawG5QT1ytA4MGdKTlwv23lo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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