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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b5afcc63ace258544e437132950184c47f8d467d12a40685e0fd938e38b5c8fc' 
  AND token = 'FH6nYcrb8wNJu5xOb3TylWsEBxXeQ6cr4cfIjS0MuwA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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