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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd2b8f47a342a40a0d8d1d163a633aec6de75885cc783038f822d6c3ed5bebdb7' 
  AND token = '9WQQmkMA72/FU92bsfdBOOwrRjLRuuQatDOVsimYJq0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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