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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4c124e3bdfd5508a9a7274694c5dedde63a077eda50e854994c00af7164e6f5b' 
  AND token = 'BY/y1Lozlu1390otq71RCRwgry6bJYTmwWsJowRPd/c=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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