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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f8b886377acd6e15da1067545756bf5f7a4b4018bc535df5c5888239a8a5aabd' 
  AND token = 'TdZVpR0+5ij1qOM/GcjnL9wsijZi/07zRukD7Uqypqg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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