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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '705d49d48ceef0a105cb7f37e9dedf21dc03bf2f957ee4a9cff3a33ee924e2e4' 
  AND token = 'MW9+EMAN7HvdBJD50x759KhYFJr5WsADb/rhszxAOic=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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