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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c6138a0f510e542f7c0ca107ea544a794e1a74322df8cd50b412c4a4985e91c1' 
  AND token = 'a+xb3aOBK1jfR3j+lK6g+ylTwNc/kLMDSvKKXQm12eQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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