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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '07921ee63dbab04d81cf405dc96e494b07d82e0e8135307d32c02dccf2297f03' 
  AND token = 'iBK0dNJf1AMh6G/42VezbGY6T651GWTPmtlCtNL/Ih4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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