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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'de243bf51817853e73d07c47e330af1d9ce7e93e5cf2d6499c74e9a71ea6276a' 
  AND token = '4e/l3BkK5bV224vBIIvO17L4eLXEu5V0kmPoEUzlv6E=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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