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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '098eba8b7e43ec429d018a58219d37369867c4daf400e886e5b244c1fb2be469' 
  AND token = '6G4+0MJV9xnNJ2nAEXYhwQ2iECQVGSyy3KF/bM3meD4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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