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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b5c137683462a17a93104b37766a2e480f39fce1a10eda8f951c909b77a908a7' 
  AND token = 'dJADePKbLC3T/SBhlxTVe8OGHuU9x6R0wgCUgcpJfrs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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