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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '97a62e579a0d0a111b6e53b2e5025411e0c5435a46ea8a417a62e7db99e8ccf7' 
  AND token = 'gVWhmrvR0GdHv2sSGRYf71+C4wEKUl96OiJHeSS7xSM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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