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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4184b478b372d76d87a93e46c7603216e258aed303a4af4237cf2d1355f4f1f7' 
  AND token = 'XsEiCJK5lIuxEdR3Jv8jjlxNBoKaCEax0x31bD1Yij8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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