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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '738107f504137ded034216179d254ecb35d40ffa83f56dd5fcb5d4c109ca5d55' 
  AND token = 'QPf07I9jDPC2mT7i3fGEv5VWZID2ysvpHHqoE5eKXNs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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