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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '22a9fc8a7d6acf98500b3b27ffd7cd8240822a12a2751b4839fbed5f722e0a82' 
  AND token = 'IUEaTsGbzG4X7Jw4G+42x4mFqIWZgAZXC5Q7s0JeLsY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00060

JSON explain

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