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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '33817803a8f8db16ecb93b2f7c5205cd7930a0784f00d2d80b79b69c068fdae4' 
  AND token = 'SNLSr3Ajssx2B/xO71LUo6B6qlvIqisd7HcyglPr8qE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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