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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4397a9a25bfdbc6248811291246db1cf315fbad98dd711fce4a3a6b7dce3334d' 
  AND token = 'ibx/FiBuDGS6St3jv81Q31ixEOfav4wn2xOVrf+4vyo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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