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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4217b6c0aed4c9f88cbedf81b2ce6efb05cf376623352084c08f3d7bfb9cd022' 
  AND token = 'vvDF0mjXfxsTSRaItz3ZcMJCLdSQ6gQjlB8sbrm4wV0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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