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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '74bb0eaad675c2948641d05b492bf67351a958c960eddd6c5e7ae7ef16c109dd' 
  AND token = '+ZD7BHO380Cr7XbfkjvJiR49Wjq0FDfevcO2MApv2M4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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