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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '662492c062954db36c3a0f0141305eb91e99eeb51f7d0715ed11426dac6f43c2' 
  AND token = 'mknTLE7QiVY4Zs/dUm8ijse8l/kOJen8r5Soxo7ijKE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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