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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b486cb1f01e6d7fb786a4738469d87b3a62ce3560e6e5986c6198585ea8ff0a7' 
  AND token = 'PmwzAU4n0reEe7Eu/MFqy8WMQROAtL1sTk8U0vbssfw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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