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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4e9d17e7e997901da0193f27caebd9ec1ebd6aa7430f7f0719336b8d667fb447' 
  AND token = '4kTwTVCgAMjr75sgHsKrdzb/BDxVi1xy+OzesAhE4AE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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