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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8630e0f9ef387aae26efaf9b8d1872dfa43f5619d43a6b0755c38be349649714' 
  AND token = 'APntV9IvAm0Kx0KEfu8M+aBZAPS4o+/jwfDF1QHH4cU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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