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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ccf292e4b5e66bb7b4c2a700b295bbbe537adba6767fbf5f3386bee768a18cc8' 
  AND token = 'Y9lWRaK7e7bt2osLz/h0gdUYL9xResM525jv9aIl5z0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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