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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '368f2cb301fb33518940be1b68a5e615ebb1b0874f90b2607922b42ee983d6b4' 
  AND token = 'DvAi2BFnMuq0BnjHN0FnIBnxlvdvK8s8hYvRQJz70Ao=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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