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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd5020400ce87b74aaebcaf9e3ef828eda262163362f5950d58ce7a3768a6f12a' 
  AND token = '6M501CWsG/fh0s1rt6aYha494Fk29hQ1bK12Tvs5BpY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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