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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0be46e98221a1ed455a9625fa8dbd1807f6fd4310eb11180c1aa3d395d374bd9' 
  AND token = 'M2vckMns6xqLP8IM5cSfuInXMBEEuyx5QI/82lbH6p8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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