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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '02a26c128ce434c5d64d57c29860fa391870e9ba2e87b05c52fd342370ea1a4d' 
  AND token = 'eo568+GnBOeF/OVIG0qWybQxopPMS4UpdObNyWjwI7E=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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