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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '069cf5a0aa33a6929555fb14fcefd78343cb6723d4c8fd43a6f0ae78d7b20c98' 
  AND token = 'Q8RxiawsF0EMfL221pzTWlrDvvMrqTTT3J5NqaC2eWc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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