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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '97e6c69923698182d2293bb50bd0c365e82460e665dab344be8aaa047c6f91d5' 
  AND token = 'XcG3ute8P8ATQRl11m/jnRqoomRQ8tkZcnf5sPn9CI0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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