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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '550c69e66544f3e15ed2fe04808e6272bd9e0bfa2c25cc8eba76f80574426ede' 
  AND token = 'O6H+046gtGClFSNGpJfk7MSFRFKRXCRZSYTs/fuu6xs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00175

JSON explain

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