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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9a1f38878b4b84006bdb2e351f3c3933dad2176b32ca3fe8bbe8c609ef37e84d' 
  AND token = 'Y07p4TLKfwcRyGO4EkhEQGEThx7qh3njTm3fPbOTI6w=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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