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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '37389240fac366273bb1d129df3ec29cc69a34143d12cbc26e23fef5dceee6fb' 
  AND token = 'q1Mh6578TbfbxHiyL2sbYp5OReTe+D+W2TC8xzyC8Yg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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