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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3e4cc0221736aa37466cf2b28e4d522f3af7f554f4aca03e0de427d44741c449' 
  AND token = 'lVnGt1dSyTrYeTcw+dDhDrfG1h6FSaqV5NJdxioaw1U=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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