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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e7c49590b11a8a146b06f30a42404441165e2627dbd47cc9cdb19d60529a4827' 
  AND token = '4rOWHljJnYDWXONEVW9zettbEfauMu4XO0wNYgsUvRU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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