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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f8970d322d21c1ded992434117ae6011c9e94e1129c1c3400838c46fb37213f4' 
  AND token = '37Q5CwvOGJijZC3zjMrcuGJhdQb/RR9Mh/8BO1fqJ40=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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