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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '430f541626fae1a3c0964d7ac731fda7eb09e2f6b09645e56391ed3b87014e29' 
  AND token = '/edtBMYo5IfuL1ZO/2HouH7iUEIAorlUgao+JJhiG8c=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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