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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f53544eb62cc8734cd39fbd0b4ecbc6576a2305562eeb8001db5a8f03e294628' 
  AND token = 'hkcvrBIj5iNJ+0xJ4bpXBEwdSxQPTxxbnp8qkd3Q1Ec=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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