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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '20a0731de19d1c166aaeff4b215a1f4ec7dbf2a7bab1571fc3e9f0239678148e' 
  AND token = 'Y4WjetMfqfFyp5XIoUrL6SJuoUeEvdd2azRbjBUMWa0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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