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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd2491264e618384c6f4726326768c014657d6b60877b18d797ebdc85c2fc09bf' 
  AND token = 'D0J29H3K1Yn2TtiNlk0uxexHVVuDnuZbK+mB/v+DL54=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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