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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '105d6700d1a01b9e2fde6ac28b430d8443b03762cd233a495e1e07791bea86ae' 
  AND token = 'hKe/H5KJ27yp25hu/L/uTxIOsgK8uEWbfQaVwvkaiks=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00045

JSON explain

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