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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0d35eda666739b938448b13c791221a43402323fec3cbd9bbe23664b4b2c9375' 
  AND token = '4p4L0ubOi3tjOlBAg3OeB29z991SrBw4RMXQLJiNAoc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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