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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f291739891685c286ae6ac9920ceede1954acdbaf34f4b410e04fbf6ba6e4715' 
  AND token = 'wf6LuOUO+a4UGfRzS1cCvoaUw6nR4EWLUKIOYtiDk0M=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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