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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7baa0c58a7d287bc5c774ada8792a815c334f2d3ac8e4f2ea18cb82b41f4317f' 
  AND token = 'KGRflCwaRt5FHHSO8xDr1+JvdrRumSM14eukSab235w=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00058

JSON explain

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