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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '09659e3f549d1213548094fccea431ecbcc11740782906e314317ad5d06ca32c' 
  AND token = 'QdyEszF/sVOm6XV83wJm0PiuLK4H4cDhyhaUuCow8xc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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