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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f196559b7d9fda5890ef0a67c7bd11c695257b6b530f11402365edffe19faf01' 
  AND token = '5Z9tlG5THl2/zn9DPDYd/Vb6C4ieFP2oI6/AEtVEQqo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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