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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1a5d3f96ed73891b90196d747fde55c2d0ef25fa137a365fc3a66b85b855d5fa' 
  AND token = 'MVOmPdd8yd47MkYny0yjgItmdPs9DEXfffjpA4QAQf0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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