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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'cf58b1e41fc22f5faed80c92c87fe319d0fa50ecf26a1d1c775f29aad410183f' 
  AND token = 'sP0swfd5e/N6quzPu2+H6Svb1YRJck54eSQiAWSCvcE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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