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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '10b8d242b0aaeabfc0b060b7d6a4cfd06e5930d01835d3528a979644edfc69ba' 
  AND token = '2ysZsyxJjVldL7o+Ms+1T3bSoRP/3WUsTWphkUREX60=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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