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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '60829c557e05a04d3b161c96e7655b82db601aefee22e3233a1af1a312cde9a0' 
  AND token = 'P9vJnc+98KW1BABA9xWiv3n52g4lbm0UA+pf4uqeI/s=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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