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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4bb046bdd768aa9344789e3aa5ce56be608ee12e5a88a0ae0f49ee1e1b79359a' 
  AND token = 'eTc1T2g6cDsP9OCzEdj40cgnWUusfR4ZQCJx1y5YzmQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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