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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a84be4ef976bc988f0c6723c9745fc82557c8501cf0dc83ae4ecc0f799055bcb' 
  AND token = 'O6t4mkvzmysZSG1bIowEJaT2tjygyfimt+gyr3OzTrg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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