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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'da73360cdb24b5f7316c421b4647876744ff3dced3a26407aeb9be4153a0832b' 
  AND token = '4AC1daL4l9DT/isl7W1J3Ybg+Chfj/Ue4KyruELiOrA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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