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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd7caea4827aba1cad1f93699e9871c08e8e4ba00459b32f9657934a494bcf3bc' 
  AND token = '3hkPn+zUI/r5EPbyZXu4tbSKQRE1ilFrSfgfJkzrPOU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00015

JSON explain

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