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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b52f3bd11ff75d69cd9d2d7ca4012dbd926483e62d7948650d3a96d1447c19c7' 
  AND token = 'WITDemKMA0jBrJ7i5v/Aflimtm+zAeWKNc8pjIJXMZk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00044

JSON explain

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