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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '13fdfbf4f74abcdef6967bf0dc2af02437e751e109e5c4b90b819730a6d2779a' 
  AND token = '3Y1+mk/lv+SGm/d45vA5HCIx+Sgev3TMxF0+qDsPik8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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