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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '32592be82c8d2ec890091033e2dbfb2783175cbc3a81b09fd7e40c132e024e5a' 
  AND token = 'o7bUL7rsQzUOON3ZaIBN0KhT1/sn7oU8nD8aheojXjE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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