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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '23f40f06c08f9119a0e41a513c2b87af7a7413d278941ecd34f11a05031d1a02' 
  AND token = 'f5YxqX3BLfL3tuSKKhNgvxXCzPlO9H/qWhqnTxr7dd4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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