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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'eeeb1adb640ae404805bba59517ad1588c18aa184570a6392e891a68820327a8' 
  AND token = 'kL7PpGPWr9CYZyXvqmlqltn5sYoYlbFjcw9n6H8npa0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00015

JSON explain

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