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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4626d4a049c133bed942fd80d652feac22f4635a45a56fca9c78ff9a7f1090b6' 
  AND token = 'jqkJ0uNrCru1SV/KAy4DuDlpiVogzUV4U2J4doMRSbk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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